Publications Conference paper · Delay-tolerant networks · 2015

Preliminary results of an evolutionary approach towards Contact Plan design for satellite DTNs

Juan A. Fraire, Pablo G. Madoery, Jorge M. Finochietto, and Guillermo Leguizamón

IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE), pp. 1–7, 2015

Abstract

Delay and disruption tolerant networks (DTNs) are becoming an appealing solution for extending Internet boundaries so as to embrace disruptive communications. In particular, if node trajectory and orientation can be predicted as in satellite networks, routing schemes can take advantage of the a-priori knowledge of a contact plan comprising the forthcoming communications opportunities. However, the design of such a plan need to consider both available spacecraft resources and the expected traffic which is largely foreseeable in space applications. In this context, the existing Traffic-Aware Contact Plan (TACP) procedure exploits this properties, but the computation complexity of its theoretical formulation results prohibitive for real satellite applications. As a result, we propose CPD-EA: a genetic algorithm to provide sub-optimal yet efficient and implementable contact plans in reasonable time. In particular, we describe the algorithm strategies and evaluate its preliminary performance in a realistic Low Earth Orbit (LEO) scenario demonstrating it usefulness for planning future DTN-based satellite networks.

Cite

DOI 10.1109/wisee.2015.7393097

BibTeX

@inproceedings{DBLP:conf/wisee/FraireMFL15,
  author    = {Juan A. Fraire and Pablo G. Madoery and Jorge M. Finochietto and Guillermo Leguizam{\'{o}}n},
  editor    = {Ron Brown and Ali Abedi},
  title     = {Preliminary results of an evolutionary approach towards Contact Plan design for satellite DTNs},
  booktitle = {IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)},
  pages     = {1--7},
  publisher = {{IEEE}},
  year      = {2015},
  doi       = {10.1109/wisee.2015.7393097}
}

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Design challenges in contact plans for disruption-tolerant satellite networks Juan A. Fraire and Jorge M. Finochietto IEEE Communications Magazine, 2015
Abstract
During the past 20 years, space communications technologies have shown limited progress in comparison to Internet-based networks on Earth. However, a brand new working group of the IETF with focus on DTN promises to extend today's Internet boundaries to embrace disruptive communications such as those seen in space networks. Nevertheless, several challenges need to be overcome before operative DTNs can be deployed in orbit. We analyze the state of the art of effective design, planning, and implementation of the forthcoming network communications opportunities (contacts). To this end, different modeling techniques, system constraints, selection criteria, and methods are reviewed and compared. Finally, we discuss the increasing complexity of considering routing and traffic information to enrich the planning procedure, yielding the need to implement a contact plan computation element to support space DTN operation.

HAL Publisher
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Abstract
Delay tolerant networks (DTNs) have become a promising solution for extending Internet boundaries to challenged environments such as satellite constellations. In this context, strategies to exploit scarce communication opportunities, while still considering device and application constraints, are still to be investigated to enable the actual deployment of these networks. In particular, the Contact Graph Routing (CGR) scheme has been proposed as it takes advantage of the contact plan, which comprises all future contacts among nodes. However, resource constraints can forbid the totality of these contacts to belong to the contact plan; thus, only those which together meet an overall goal shall be selected. In this article, we consider the problem of designing a contact plan that can provide fairness in link assignment and minimal all-to-all route delay; therefore, achieving equal contact opportunities while favoring end-to-end traffic latency. We formalize this by means of a multi-objective optimization model that can be computationally intractable for large topologies; thus, heuristic algorithms are proposed to compute the contact plan in practice. Finally, we analyze general results from these routines and discuss how they can used to provision valuable contact plans for real networks.

CONICET Digital Publisher
Assessing Contact Graph Routing Performance and Reliability in Distributed Satellite Constellations Juan A. Fraire, Pablo G. Madoery, Scott C. Burleigh, Marius Feldmann, Jorge M. Finochietto, Amir Charif, Nacer-Eddine Zergainoh, and Raoul Velazco Journal of Computer Networks and Communications, 2017
Abstract
Existing Internet protocols assume persistent end-to-end connectivity, which cannot be guaranteed in disruptive and high-latency space environments. To operate over these challenging networks, a store-carry-and-forward communication architecture called Delay/Disruption Tolerant Networking (DTN) has been proposed. This work provides the first examination of the performance and robustness of Contact Graph Routing (CGR) algorithm, the state-of-the-art routing scheme for space-based DTNs. To this end, after a thorough description of CGR, two appealing satellite constellations are proposed and evaluated by means of simulations. Indeed, the DtnSim simulator is introduced as another relevant contribution of this work. Results enabled the authors to identify existing CGR weaknesses and enhancement opportunities.

Publisher

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